Chaldfont said:
You mean there's one that predates the Bogart movie?
According to wikipedia, which is never wrong...
The novel has been filmed three times, twice under its original title:
* The Maltese Falcon (1931), the first version, pre-Code production starring Ricardo Cortez and Bebe Daniels
* Satan Met a Lady (1936), a light-comedy adaptation starring Bette Davis, with Sam Spade becoming "Ted Shane".
* The Maltese Falcon (1941) the third version, considered to be a film noir classic, starring Humphrey Bogart, Mary Astor, Peter Lorre, and Sydney Greenstreet.
There have been many spoofs and sequels, including 1975's The Black Bird, a spoof sequel featuring George Segal as Sam Spade, Jr., and Elisha Cook Jr. and Lee Patrick reprising their roles from the 1941 version.